Sheet-slotting structure



Aug. 7, E923. 1,4643%) A. CUMFER SHEET SLOTTING STRUCTURE Filed Aug. 29. 1921 2 Sheets-Sheet 1 Aug; 7, 11923. L46439 H. A. CUMFER s H E E T s L OTTING STRUCTURE Filed Aug. 29, 1921 7 2 Sheets-$heei 2 I of the invention Fetented A 7 19 HARRY A. CUMFEE,

OF CIGAGO, ILLINOIS, ASSIGNOR T0 GUYTUN & (CUMFEEE MFG.

$0., A CORPORATION OF ILLINOIS.

SHEET-SLOTTING STRUCTURE.

Application filed. August 29, 1921. serial No. lQGJht.

provide improved rotary knives and knife structures for making elongated,

holding spaced-apart slots in a moving uniformly, sheet.

Another object is the provision of improved means for making slots, at intervals in a moving sheet whlch are uniformly spaced-apart transversely and longitudinally of the sheet.

Another object is to provide improved means, useful in making shingle simulating strips from a continuous moving sheet, in which the shingle-like butts are distinguished by the dividing slots.

Another object is the improved construction of revolving knives or blade cutters and the heads within which they are adjustably held whereby the knives may be removed and sharpened, replaced and readjusted therein, without materially changing the diameter of the cutters.

Another object is the provision of means for severing one end of the tongue, or the plart removed from the sheet in making the s ots.

Other, further and more specific objects will become readily apparent, to persons skilled in the art from a consideration of the following description when taken in conjunction with the drawin wherein *ig. 1 shows the end view of a pair of cooperating rotary cutters as they appear on parallel shafts.

Fig. 2 is a side elevation of the cutters.

Fig. 3 is an end view looking in the direc- Eion the arrows are pointing on line 33 of F Fig. 4 is a similar view on line H of lg. 5 is a section on line 5 5 of Fig. 2.

Fig. 6 is a section on line 66 of Fig. 5.

Fig. 71 is a section on line 7-7 of Fig. 5.

Fig. 8 is a perspective view of one of the cutting knives.

Fig. 9 is a perspective view of the means to for severing the tongues at one end.

In all the views the same reference characters are employed to indicate similar parts. There are two heads each carrying one or more pairs of knives; the head 15 is secured as to the shaft 16 by set screws 17, or otherwise, and the head 18 is secured to the shaft 19 by the set screws 20, or otherwise. By this means the knife holding head structure may be longitudinally adjusted of the shafts re 16 and 19 so that they will axially cooperate. One of the structures consists of the head 15, the spacing ring 22 and the clamp- }ilngdring 23, the latter heing held to the ea spacing ring and clamping ring into the head. The spacing ring 22 is transversely grooved on each of its sides as wide as the knives 2525,and 26-26, respectively, and

15 by the bolts 24 which pass thru the to a depth slightly less than the thickness so of the knives, so that when the clamping ring is firmly pressed toward the head by the bolts 24 into its operative position it will firmly clamp and hold the knives in the positions in which they have been placed.

Each of the knives, indicated by 25 and 25", has a beveled, arcuate cutting edge 27 and an arcuate internal surface 28, of shorter radius, with a notch 29 extending between the two arcuate surfaces of the knife, thus eo producing legs 30 and 31 on either side of the M028. The notches 29 straddle opposite bolts 24 so that the knives may be moved radially of the structure and clamped in any desired position.

From the foregoing description it will be manifest that the knives 25-25', either or all of them, may be removed and sharpened and replaced as many times as permissible by the space between the cutting edge 27 and the bottom of the slot 29. he space between the grooves in the spacing ring 22 will determine the width of the tongues to be taken from the slot in the moving sheet of fabric.

The circumferential distance between the knives, as they appear in the head, will determine the distance of separation between the slots. The knives 25 and 25 will, preferably, project beyond the outer boundary of the spacing ring 22 to an extent equal to substantially the thickness of the fabric in which slots are to be cut.

In each one of the spacing rings or plates 22 there is provided a notch 32 and a slot 33 to receive a cutting-off end knife 34. The knife 34 is provided with a bevel end edge 35 which is sharpened to cut off the tongue at one end of the slot to be made in the constantly moving sheets.

An abutment 36 is provided between the notch 32 and the slot 33 for a clamping screw 37 which is employed for the purpose of securing the knife 34 in place. There are shown two knives 34, one at each end of the pairs of shearing knives 2525.

A spacing plate 40 is secured to the head 18 by the bolts 41 and the clamping ring 42. The spacing plate 42 is grooved on each side, as at 43, to receive two pair of shearing blades or knives 44 and 44'. These shearing plates are substantially the same shape as the knives 2525 and are extended from and adjustable in their respective head in the same way and are clamped by similar means consisting of the screws 41 and clamping plate or ring 42. At the end of each of the shearing blades 44-44 there is provided a notch 45 to receive a clamping screw 56 and a slot 47 is provided in the spacing plate 40 to receive a shearin lug 48 for cooperation with the knife 34. lug 49 extends radially between the slot 45 and the groove 47 thru which the clamping screw 46 is threaded and by which the lug 48 may be adjusted and securely held in place.

Now, it is apparent, that the knives 2525' may be extended radially of the shaft 16 and firmly clamped in place and that the cooperating shearing blades 44--44' may be in like manner extended and securely clamped to their respective heads.

After the knives and shearing blades have cut the tongue from the movingsheet by the rotation of the respective heads in opposite directions, the cutting off knife 34 will encounter the end of the shearing lug 48 and one end of thetongue will be severed from the sheet, after which the other end of the tongue may be cut from the sheet when the shingle strips are being severed, as usual in shingle making machines of this character.

After the heads 15 and 18 have been placed in proper relation on the respective shafts 16 and 19, then the set screws 17 and 20 may be tightened to hold the heads in their proper positions with respect to each other and upon their respective shafts.

While I have herein shown a single embodiment of my invention for the purpose of clear disclosure, it will be manifest, to persons skilled in the art, that changes may be made in the general arrangement and configuration of the parts within the scope of the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent, is

1. Means for cutting spaced-apart slots in a moving sheet comprising a air of heads to be mounted on parallel shafts; a pair of radially adjustable shearing blades mounted on each side of each head cooperating to cut a slot; means to clamp the blades to the heads and a knife extending transversely of the blades to sever the tongues cut from the slots.

2. Means for cutting spaced-apart slots in a moving sheet comprising a pair of heads to be mounted on parallel shafts; a plurality of pairs of radially adjustable shearing blades a pair mounted on each side of each head cooperating to cut a plurality of slots; means on each head to clamp the blades to the respective heads and a knife at the end of a pair of blades to sever the tongues cut from the slots.

3. Means for cutting spaced-apart slots in a moving sheet comprising a pair of rotatable heads, each head provided with a spacing ring having transversely extending grooves one on each side; a pair of radially movable cutting blades in each groove, said blades being slightly thicker than the depth of the groove; a clamping ring overlying the spacing ring and bl .les; and screws passing thru both rings into the head to hold the blades in place.

In testimony whereof, I hereunto subscribe my name.

HARRY A. (JUMFER. 

